When do you call interference?

[Dakota]

I don't have my rule book handy (i.e. it's in the car and I don't wanna go get it so I'm just gonna wing this), but as I recall, ASA rules talk about a runner interfering with a fielder "making a play" (quote or close paraphrase), or interefeing with a thrown ball.

Certainly a fielder who has just gloved the ball and is preparing to make the throw is "making a play," right?